104 
THE SEAWEEDS 
ASPEROCOCCUS Lamouroux. 
Frond hollow, intestiniform or flattened, stipitate. The wall of the 
frond consisting of a few layers of cells decreasing in size outwards. The 
interior space is traversed here and there by jointed slender filaments. 
Unilocular sporangia globose, accompanied by few-jointed paraphyses, 
densely distributed over the surface. Plurilocular sporangia ovoid or 
ellipsoid, crowded in sori. 
Fig. 56 . — Asperowoow bullos-m — (a) young plants growing on Posidonm 
with sori; (b) adult plant with sori; (c) three sori; 
(d) section of sorus. 
Asperococcus bullosus Lamouroux. 
Fronds attenuated at base, swelling out into gut-like elongated sacs, often 
constricted into segments. Sori small dotted over the surface. To 30 cm. 
high and 2.5 cm. in diameter. Dark greenish-olive. 
World-wide. All the southern coast of Australia, Tasmania. 
Family SPHACELARIACEAE. 
Fronds caespitose, erect, polysiphonious. Parenchymatous structure, 
lengthening by divisions of an apical cell. Sporangia formed in place of 
ramuli, or of the joints of ramuli. Unilocular sporangia ovate or sub- 
globose, plurilocular obovoid or cylindrical with several rows of locelli. 
Occasional propagation by gemmae, short detached branches. 
SPHACELARIA Lyngby. 
Small plants 5 to 20 mm. high, attached to rocks or shells by a basal disc, 
or parasitic on other algae. Both unilocular and plurilocular sporangia, 
without paraphyses. 
